See post 376. This is my theory behind the argument.
I can recall stuff being forced into school curricula by politicians fourty years ago. Students knew it was crap and just laughed.
In principal I think all kids should be taught that science is a way of investigating things, and that the facts of science are presented as facts because they have survived hundreds of years of investigation -- not because they are the ultimate truth.
There are, of course, plenty of unsettled issues in science -- global warming, for example -- where warning labels would be useful.